What acceleration of gravity at the width of 45.5 ° at sea level is equal to, it is known to everyone. It is much more interesting to learn to what it equals in your area. For this purpose it needs to be measured experimentally.
Instruction
1. Take the electronic clock with function of a stop watch. Also prepare two push-button switches without fixing, one of which has two contact groups: disconnecting and closing, not connected with each other galvanic, and the second - only closing. As the second it is convenient to use the microswitch supplied with the lever.
2. Arrange the second switch on the horizontal platform, and attach the second, mobile platform which is also located horizontally to its lever. It has to be rather easy not to press the lever under the influence of body weight.
3. Connect the closing groups of contacts of both switches parallel to the button of hours which in a bottom the stop watch is started and stops. Through the disconnecting group of contacts of the first switch connect to the power supply an electromagnet with suitable parameters. Parallel to it for protection of contacts against tension of a self-induction connect diode 1N4007 in the return polarity.
4. Arrange an electromagnet over the platform at height of an order which is exactly one meter. Turn on the power supply and suspend on an electromagnet a ball from a computer mouse of old type.
5. Put clock in the mode of a stop watch and drop its indications.
6. Press the button of the first switch. The ball will separate from an electromagnet, and the stop watch will be started. Having fallen to the platform, the ball will cause operation of the second switch and a stop of a stop watch. On a board time in seconds during which the ball overcame distance in one meter will be displayed.
7. Calculate acceleration of gravity by the following formula: g=2d/t^2 where g is acceleration of gravity, м/с^2, d is height, the m, t is time of falling, page.
8. To find acceleration of gravity more precisely, make experiment several times, calculate an arithmetic average of all measured time intervals, and then set up him in a formula.